Artificial tooth



I. M. HAIR.

ARTIFICIAL TOOTH.

APPLICATION FILED OCT. 3; 1919.

1,333,804. Patented Mar.16,1920.

WITNESSES IN I/ENTOR ATTORNEYS warren STATES PATENT OFFICE. T

ISAAC M. HAIR, F SPARTANBURG, SOUTH CAROLINA.

ARTIFICIAL moo'rm T0 altwhom it may concern: 3

. Beit known that I, IsAAo M. HAIR, a citi zen of the United States, and a resident of Spartanburg, in the county ofSpartanburg and State of South Carolina, have made certain new, and useful Improvements in Artificial Teeth, of which the following is a specification. p v

. My present invention relates generally to artificial teeth. and more particularly to novel effective means for securing the teeth faoings in connection with backing members for use principally in bridge work.

It is a well known fact that means new employed and in general use for the purpose of securing tooth facings in. connection with backings, while capable of effective employment with relatively thick heavy facings, be come ineffective andinsuiiicient for the desiredjpurposes in connection with thin fac- X ings,z'. e., where it is necessary to grind the facings thin to properly fit them in relation to otherteeth. I

It has been proposed to boretooth facings for the reception of pins carried by backing plates, the pins being cemented in the tooth bores and this method is now commonly employed and'has beenfound insufiicient un-. der the circumstances above mentioned.

Myinvention aims at the provision of an active lock cooperating with the tooth facings and oneor more pins cemented therein,

. the locking element itself being cemented in place so that a strong permanent union is efl'ected even where the tooth facing is so thin as to render the usual connection, or connection without a'lock, ineffective.

Withthe above in mind, my present invention can be better understood from the following detailed description, reference being made to the accompanying drawing, which forms a part'of this specification and in which; i

Figure 1. is a side View of an artificial tooth showing the practical application of my invention,

Fig. 2 is a sectional view through the toothprepared for association with its bacle Fig. 3 is a rear elevatlon of the tooth and backing as seen in Fig. 1, r

Fig. this a detailed perspective view vof a Specification of Iietters Patent. Patented Mar; 16, 1920- i Application filed October 3, 1919. Serial rmeasasa.

tooth backing constructed in accordance with my invention, and v f Fig. 5 isa detailed perspectiveview of the locking pin provided by my invention.

Referring now to these figures, my inven tion proposes the provision, in artificial teeth, of which one is indicated at 10 in Figs. 1, 2 and 3, of bores, preferably includ ing a bore 11 which upstands into the material of the artificial tooth atright angles to its base or lower surfacel2 and the upper endof which is intersected by a, horizontal bore 13 at whose outerend is a conical counter bore .14. v p

The tooth may also have the bore 15 up standing therein at a forwardly inclined angle, bores 11 and 15 respectively receivingupright pins 16 and '17 of a tooth backing plate 19, or abridge plate 20. Of these pins 16 and 17 which in practice are pressed upwardly into the tooth bores and into ce ment, the pin 16 has an upper transverse opening 21, which is adapted to line with the horizontal bore 13 of the tooth for the reception of a locking pin 22 shown in detail in Fig. 5, this pin being finally cemented in the bore 13 after the parts are properly fitted, and having an enlarged-head 23 at one end which is cemented in the counter bore 14: and subsequently ground flush and burpins cemented therein, is insuflicient particuf larly in case it becomes necessary for fitting purposes that the tooth facing be ground very thin. It is obvious in this case, that the pins'would'have to be cut down in length,

and without a positive lock they would and do loosen very readily. With my improved locking pin and extra bore, however, one of the pins, no matter how short they may he, is

effectively engaged and held ina permanent manner and by a means, the size and effectiveness of which are not diminished in any g r r 1333394 way through cutting down in the height of the tooth.

. I claim I p a 1.. An artificial tooth including a backing having a projecting pin, a facing having a bore to receive thesaid pin and provided with second bore i'einote'from the backing at an angle to and intersecting, the first bore and a locking pin in the secondboreto engage the backing pin in the first bore, and

securely hold the same against displacement.

2. An artificial tooth including a backing, having a projecting pin, a facing having a boreto receive the said pin and provided 15,

with a second bore at an angle thereto and intersectingthe first bore, located in spaced, approximately parallel relation to the backing and a locking pin in the second bore to engage the backing pin in the first bore, and securel3- hold the same againstdisplacement,

" said pins being cemented in their respective the tooth,'and extending through the open-- bores, as described. V

- 3.1m artificial tooth including a backing having pins projecting therefroin'at differ ent' angles, a facing having bores extending therein at angles corresponding to the said backing; pins and adapted to receive thelatt er, said facing also having a bore opening through its side reniote froni'the backing and arrangedat'an angle to and intersecting one of its first mentioned bores, one of said pins inone of the intersecting bores/having an openingpositioned to register with the last mentioned bore of the tooth anda locking pin secured in the-last mentioned bore of last mentionedbacking pin, as described.

4. An artificial tooth including a backing, having a pin projecting therefrom, a facing having one surface for engagement of the backing plate and having a bore extending inwardly from said face to receive the backing pin, said facing being provided vvith a second bore at an angle to and intersecting its first boreand opening through another surface of the facing remote from the backing, said backing pin having an opening positioned to register with the second bore, and a locking pin securedvvithin the second bore of the facing and extending throughthe opening of the backing pin.

5. An artificial tooth including a backing,

- having a pin projectingtherefrom, a facing outer end and said locking; pin having an enlarged head at one 'end secured Within the counter bore flush 'with the adjacent tooth surface, as described.

ISAAC M. HAIR. 

